5712781 has 4 divisors (see below), whose sum is σ = 5729500. Its totient is φ = 5696064.

The previous prime is 5712769. The next prime is 5712823. The reversal of 5712781 is 1872175.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3006756 + 2706025 = 1734^2 + 1645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5712781 is a prime.

It is a super-2 number, since 2×5712781² = 65271733507922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5710781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7836 + ... + 8533.

It is an arithmetic number, because the mean of its divisors is an integer number (1432375).

Almost surely, 2^5712781 is an apocalyptic number.

It is an amenable number.

5712781 is a deficient number, since it is larger than the sum of its proper divisors (16719).

5712781 is a wasteful number, since it uses less digits than its factorization.

5712781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16718.

The product of its digits is 3920, while the sum is 31.

The square root of 5712781 is about 2390.1424643732. The cubic root of 5712781 is about 178.7650131651.

Subtracting from 5712781 its reverse (1872175), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 5712781 in words is "five million, seven hundred twelve thousand, seven hundred eighty-one".